/*
 * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
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 *
 *
 *
 *
 *
 *
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 */

package com.sun.corba.se.spi.ior;

import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;

import com.sun.corba.se.impl.ior.FreezableList;

import com.sun.corba.se.spi.ior.TaggedComponent;
import com.sun.corba.se.spi.ior.Identifiable;

/**
 * Convenience class for defining objects that contain lists of Identifiables.
 * Mainly implements iteratorById.  Also note that the constructor creates the
 * list, which here is always an ArrayList, as this is much more efficient overall
 * for short lists.
 *
 * @author Ken Cavanaugh
 */
public class IdentifiableContainerBase extends FreezableList {
    /**
     * Create this class with an empty list of identifiables.
     * The current implementation uses an ArrayList.
     */
    public IdentifiableContainerBase() {
        super(new ArrayList());
    }

    /**
     * Return an iterator which iterates over all contained Identifiables
     * with type given by id.
     */
    public Iterator iteratorById(final int id) {
        return new Iterator() {
            Iterator iter = IdentifiableContainerBase.this.iterator();
            Object current = advance();

            private Object advance() {
                while (iter.hasNext()) {
                    Identifiable ide = (Identifiable) (iter.next());
                    if (ide.getId() == id)
                        return ide;
                }

                return null;
            }

            public boolean hasNext() {
                return current != null;
            }

            public Object next() {
                Object result = current;
                current = advance();
                return result;
            }

            public void remove() {
                iter.remove();
            }
        };
    }
}
